January is a cold month, but some pests and diseases are still active and can affect your plants. Although most insects decrease their activity in winter, it's common to find problems caused by fungi, bacteria, or pests that take refuge in greenhouses, terraces, and protected crops.

February continues to be marked by cold weather, but certain pests and diseases may reappear if conditions are favorable. In closed environments or with high humidity, fungi continue to develop easily, and some overwintering pests become active slowly, especially in indoor crops, protected gardens, or areas with mild winters.

March marks the start of activity for many pests after winter. With rising temperatures and humidity, insects such as aphids, whiteflies, and mites begin to reappear, especially in spring crops, seedbeds, and gardens. Fungal diseases can also become active if rainfall is frequent.

April is a month of active growth for many plants, but also a month of heavy pest activity. The mild climate and frequent rainfall favor the emergence of fungi such as powdery mildew and increase populations of insects such as thrips, aphids, and caterpillars in orchards and gardens.